OAR 437-007-0605: Out-of-Service Requirements for Wire Rope

(1) Wire rope must be repaired (spliced), re-socketed, or taken out of service when there is: (a) Evidence of chafing, sawing, crushing, kinking, crystallization, bird-caging, corrosion, heat damage, or other damage that has weakened the rope structure, or (b) One or more broken wire(s) at the base of a poured nubbin or end fitting, or (c) Corroded, damaged, or improperly applied end connections, or (d) 12 1/2 percent of the wires are broken within a distance of one lay. EXCEPTION: Out-of-service requirements do not apply to chokers, grapple opening lines, tag lines, cat and skidder winch lines, and droplines that are not used to move the carriage. However, in accordance with 437-007-0600, a competent person must inspect these cables daily and remove from service any that are unsafe. Figure 7-1 — Wire Rope Out-of-Service EXAMPLE 1: A 6 x 19 Independent Wire Rope Core (IWRC) wire rope must be removed from service when 14 broken wires are found within the distance of one wire rope lay. [6 strands with 19 wires = 114 x 0.125 (12 1/2%) = 14.25] EXAMPLE 2: A 6 x 25 IWRC wire rope must be removed from service when 19 broken wires are found within the distance of one wire rope lay. [6 strands with 25 wires = 150 x 0.125 (12 1/2%) = 18.75] (2) Oversized trailer lift straps must be removed from service when the strap no longer has a breaking strength equal to five times the load to be lifted. [ED. NOTE: Figures referenced are available from the agency.]